Ice cube Glue

Over a plate, press the flat sides of two ice cubes together. Slowly count to 30, then let go of one ice cube. Why do they stick together?

Explanation:

When you pushed two ice cubes together, you created pressure between the two flat sides. Pressure melted the ice, making a thin layer of water in between. When you released the pressure, the water refroze, "gluing" the two cubes together.